Sebastian Opałczyński
Fractional CTO & Technical Advisor at The One Dev
Warsaw, Masovian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolSebastian Opałczyński is a pragmatic Fractional CTO and technical advisor with over a decade of hands-on experience building and rescuing Python-first products, leading engineering teams, and shaping cloud-native architectures for startups and scale-ups. Twice a CTO and a co-founder of software houses, he combines technical audits, MVP strategy and project rescue with a writer’s habit of stating uncomfortable truths backed by data. He has led teams up to ~50 people, run head-of-dev roles in fintech, and delivered core services across Django, Celery, Postgres and GCP/AWS while keeping a keen eye on CI/CD and operational resilience. Beyond code he crafts durable oak furniture—an unusual parallel that reflects his material-led, pragmatic approach to design and long-term thinking. Based in Warsaw, he mentors engineers and founders, protects clients’ interests when working with external teams, and translates messy realities into clear technical decisions.
10 years of coding experience
12 years of employment as a software developer
MS, Informatics, Telecommunications, and Electronics, MS, Informatics, Telecommunications, and Electronics at Warsaw University of TechnologyIT project management, IT project management at Kozminski University
English
Stackoverflow
1,619reputation
123kreached
46answers
0questions
rest
top-5%
django
top-5%
django-rest-framework
top-5%
Github Skills (62)
php10
version-control10
syncano9
git9
gitignore9
django9
transactional-emails9
rest9
django-rest-framework9
email-marketing8
newsletter8
sms-gateway8
smtp8
debugging8
profiling7
Programming languages (4)
Github contributions (5)
opalczynski/snippetto_cli
Feb 2019 - Dec 2020
CLI for Snipetto service. Writen in python click.
Contributions:6 PRs, 33 pushes, 5 branches in 1 year 10 months
clickpythonpython-clickcli
opalczynski/my-reading-list
Jun 2019 - Jul 2019
Contributions:14 commits, 13 pushes, 1 branch in 10 days
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